Self-dumping scraper.



M. A. WEST.

SELF DUMPING SCRAPER.

APPLICATION FILED AUG.20,1912.

Patented May 13, 1913.

3 BEEETS-BHEET 1.

lwuewtoz M. A. WEST.

SELF DUMPING SGRAPER.

AlfPLIUATION FILED AUG. 20, 1912.

1,061,791 Patented May 13,1913.

3 SHEETS-SHEET 2.

Snow wow Weak I M. A. WEST. SELF DUMPING SGRAPER. APPLICATION FILED AUG. 20, 1912.

Patented May 13, 1913.

3 SHEETS-SHEET 3.

MAX A. WEST, OF BLIND SLOUGH, OREGON.

SELF-DUMPING SCRAPEE.

Specification of Letters Patent.

Patented May 13, 1913.

Application filed August 20, 1912. Serial No. 716,046.

To all whom it may concern Be it known that I, MAX A. Wnsr, a citizen of the United States, residing at Blind Slough, in the county of Clatsop and State of Oregon, have invented new and useful Improvements in Self-Dumping Scrapers, of which the following is a specification.

This invention relates to scrapers such as are used for excavating purposes, the primary object being to provide means for automatically dumping the dirt collected within the scraper upon the said scraper being hauled back or the direction thereof being reversed.

A further object of the invention is the provision of a movable apron or haul back adapted to guide the scraper body around stumps, rocks, or similar obstructions, when the device is being hauled back after dumping its load, the said apron being connected to the dumping mechanism by suitable means provided therefor, so that the apron serves to operate the dumping mechanism immediately upon application of the source of power or draft to the said apron in the act of hauling back.

A still further object is to provide resilient means carried by the operating mechanism for the dumping device which serves to operate said dumping device with sudden force so that the dlrt adhering to the false back which forms a part of the device, will be shaken from the same.

A still further object of the invention is the provision of means for checking the motion of the said false back suddenly when actuated by the resilient means on the op erating mechanism, the said checking means acting in conjunction with the resilient means just described to effect the complete Igenioval of the dirt adhering to the false This invention consists of the features of construction, combination and arrangement of parts, hereinafter fully described and claimed, reference being had to the accompanying drawings, in which Figure 1 is a side elevation of the device. Fig. 2 is a rear elevation thereof. Fig. 3 is a lan view of the same. Fig. 4 is a longitudinal sectional view taken on the line 4% of Fig. 3, the movable or false back being shown in tripped position. Fig. 5 is a similar sectional view showing the movable back in its operative or rear-most p0siedges rounded, as at 3,

tion. Fig. 6 is a detail sectional view of the resilient lever operating device.

Referring to the drawings, 1 designates the body of the scraper which includes the vertical side portions 2 having their rear and their front edges 4 cut vertically at right angles to the longitudinal base edges 5, and the back wall 6 which connects the side portions 2, and a cross bar 7 connecting the front ends of the side walls. The back ,6 is cut away, as at 8 to form spaced openings for the escape of dirt which may fall between the movable and fixed backs, the upright members 9 relieved by the cutaway portions being curved to conform with the general curvature of the back and which are provided for a purpose which will be more fully hereinafter described. Suitable cutting teeth 10 are secured to the lower edge of the back in spaced relation to each other, the same bein adapted to scra the dirt and being so isposed with relation to the lower ortlon 11 of the back wall that the loose irt will rise up into the scraper body. A false or movable back 12 formed of a piece of material curved to conform with the inner face of the fixed back 6 is hinged to the lower portion 11 of the said back 6, as at 13. A plurality of stop members 14 are formed on the inner faces of the side portions 2 of the body and disposed in such relation to each other as to evenly bear against the opposite side edges of the movable back when in its foremost dumping position. These stops limit the forward movement of the back and prevent the same from falling into engagement with the ground. A tripping lever 15 is pivotally connected between a pair of spaced ears 16 provided on the upper portion 17 of the fixed back 6 adjacent the cut away portion 18 provided in its lower edge, by means of the pivot bolt 19. The lower arm 20 of the said lever is offset from the main body of the same, as at 21, so that when in its rearmost position the same arm will lie between the adjacent upright members 9, thus being in unobstructing position. The end of the arm 20 of the lever is pivotally connected to the movable back 12, the said extremity being curved downwardly and provided with a curved elongated slot 22 for the reception of a transverse bolt 23 extending through alined o nings in a pair of spaced lugs 24 tonne on the rear side stumps, rocks,

of the movable back 12 and embracing said lever extremity. The outer arm 25 of the lever 15 has an opening 26 provided adja- Cent its end for a purpose which will be presently described.

The numeral 27 designates an apron or what might be termed a haul back. This apron has its side edges 28 converging rearwardly to a point 29. A substantially shaped member 30 issecured to the upper surface of the apron 27 so that its apex 31 is located at the apex 29 of the apron, the said member being provided at this point with an attaching loop 32. The ends of the arms 33 of the apron 27 extend past the forward edge 34 of the apron and are hinged to the lower portion 11 of the body back 6, as at 35. The member 30 provides reinforcing ridges which strengthen the apron and preserve its shape, and further serves as attaching means therefor. When the scraper is being hauled back, the curved side edges 28 of the apron serve to engage any or such obstructions and to shear around the same, thus preventing the scraper body from being obstructed thereby.

The loop 32 formed in the supporting or bearing'member 30 carried by the apron is adapted to have secured thereto a link 36 which is attached to the haul back draft line 37. An operating cable 38 is further adapted to have its rear end secured to the said loop, as at 39, the said cable passing forward through the opening 26 in "the tr ping lever 15 and over a suitable guide roller 40 carried by the back 6 of the scraper body toglts point of attachment, (not shown) with the 'main draft line 41 which latter is connected to the front edges4 of the side portions 2 of the said body, as at 42. The cable is'provided between the end of the tripplng lever with the apron 27 with an engaging collar 43 clamped to the same. A second collar 44 is fixedly secured to the cable 38 adjacent the end of the tripping lever and forwardly with respect thereto, a helical spring 45 be- 1ng interposed between the collar 44 and the end of the lever 15,, a movable collar 46 being attached to the rear end of the spring 45 and adapted to engage the end of the lever 15 at'the opening 26 therein.

In the operation of the device, the scraper body is hauled forward by means of the draftline 41, the teeth 10 serving to scrape the dirt and force the same upwardly within the body and against the movable back 12,

which latter as shown clearly in Fig. 5 of the drawings is in its rearmost position against the fixed back 6, the engaging collar 43 attached to the operating cable being in this position in engagement with the outer extremity of the lever 15, thereby holding the arm 25 of the lever in its foremost position, and the apron or haul back 27 being 15' and its point of connection tilted upwardly out of ground. After the scraper body has run its course and has arrived at a spot suitable for dumping the contents thereof, the source of power of draft is disconnected from the main draft line 41, and is connected to the haul back line 37 which is secured to the apron 27. As soon as power is applied to the body through the medium of the apron 27 in reverse direction, the said apron falls to the ground into its extended position, the cable 38 being drawn rearwardly with the same and the collar 43 being moved out of engagement with the arm 25 of the lever 15. During the extension of the apron 27 the movable collar 46, which i attached to the end of the helical spring 4 comes into engagement with the said lever arm. At first the spring is compressed until the force of gravity which holdsthe movable back 12 in its foremost or inclined position against the fixed back 7 is overcome. At this instant, the lever 15 is thrown suddenly so that its arm 20 moves forward and forces the mov- "able back 12 into engagement with the stops 14, the sudden impact serving to effectively loosen all the dirt/adhering to the said body and allowing the same to fall to the round through the open bottom of the bod y. As the device is hauled backward the apron serves to guide the body around all obstructions which are presented in the course of the same. Then when it is desired to move the scraper forward again'so as to fill the same with dirt, the source of power .or draft is detachedfrom the haul back line and is again connected to the main line 41. As the power is applied to the main line so as to draw the body forward, the cable '38 is likewise drawn .forward, and inso doing the movable collar 46 moves out of engagement with the lever arm and the fixed collar 43 comes into engagement therewith so asto throw the said arm of the lever forward, the inner arm 20 of the lever being thus thrown outwardly and carrying the movable back 12 with it into its operative position against the fixed back 6. During movement of the inner arm 20 of the lever with respect to the movable back, the extremity thereof is free to move between the attaching lugs 24 as limited by the movement of the bolt 23 within the slot 22 thereof.

WVhat is claimed is:

1. A device of the class described comprising a scraper body consisting of side walls, a fixed back connecting the side walls, means for attaching a source of motive power to the front end of said body, taching the source of power to the rear end thereof, a movable back disposed within the said body and hinged to the fixed back, a tripping lever pivotally connected to said fixed back and having its inner arm operatively associated with the said movable engagement with the I means for at p said lever so as to throw the movable back into its forward dumping position upon movement of the body in the opposite direction.

2. In a device of the class described comprising a scraper body consisting of side Walls, and a fixed back connecting the side Walls, a'movable back disposed within the body adjacent the fixed back, a tripping lever pivotally secured to said fixed back and having the end of its inner arm pivotally associated with said movable back, means for attaching a source of motive power to either end of said body, an operating cab-1e connecting the said attaching means and movably associated with the outer end of said tripping lever, means fixedly secured to said cable for engagement with said outer arm of the lever to actuate the same and throw the movable back into its rearmost position against the fixed back upon forward movement of the body, and resilient means carried by the cableand adapted to. engage said lever arm upon movement of the body in the reverse direction to throw the movable back suddenly forward into its dumping position upon movement of the body in the opposite direction, and stop members provided in the side walls of the body for checking engagement with the movable back upon arriving at its foremost position.

3. In a device of the class described, the combination with a scraper body, a dumping device located within said body, and a tripping lever carried by said body and operatively connected with the said dumping device, of means for attaching a source of motive power to the front end of said body, an apron hinged to the rear end of said body adapted to swing vertically, means carried by the free end of said apron for attachment to the said source of power, and a cable connecting the said means of attachment and operatively associated with said tripping lever, said cable adapted to support the apron in inoperative position during forward movement of the body.

In testimony whereof I affix my signature in presence of two witnesses.

MAX A. WES

Witnesses:

JAMES YOUNG, J. L. GRIMES. 

